With modular (prefab) homes built in factories according to specific measurements, there’s no need for excess material, which reduces building waste significantly. Assembled according to strict guidelines, they also reduce waste on site. (Renovation and construction waste accounts for around 40% of landfills). Self-sufficient modular homes can lower a home’s energy consumption by up to 72%. Typically powered through solar panels, batteries can be added for storing excess solar energy. Cladding made of cost-effective composite panels can be installed to improve insulation. Designs aim to reduce heat loss from shorter pipes by grouping together areas needing water like bathrooms and kitchens. Solar-based water heating systems can provide up to 90% of hot water. Use of recycled and non-toxic or low VOC building materials is frequent.
https://pebblemag.com/magazine/living/modular-homes-ecofriendly-reasons